Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock [Member]	Treasury stock [Member]	Capital in excess of stated value [Member]	Retained Earnings [Member]	Accumulated other comprehensive loss [Member]
Beginning balance at Mar. 31, 2015	$ 124,188	$ 9,482	$ (2,646)	$ (10,675)	$ 128,178	$ (151)
Beginning balance (in shares) at Mar. 31, 2015		31,607	8,817
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	3,405			3,405
Restricted shares issued	0		$ 54	(54)
Restricted shares issued (in shares)			181
Shares issued upon exercise of stock options and SSARs	0		$ 1	(1)
Shares issued upon exercise of stock options and SSARs (in shares)			2
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(329)		$ (9)	(320)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(30)
Net loss	(3,765)				(3,765)
Unrealized foreign currency translation adjustments	(26)
Unrealized translation adjustment	(26)					(26)
Ending balance at Mar. 31, 2016	123,473	$ 9,482	$ (2,600)	(7,645)	124,413	(177)
Ending balance (in shares) at Mar. 31, 2016		31,607	8,664
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	2,427			2,427
Restricted shares issued	0		$ 83	(83)
Restricted shares issued (in shares)			277
Shares issued upon exercise of stock options and SSARs	0		$ 10	(10)
Shares issued upon exercise of stock options and SSARs (in shares)			33
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(483)		$ (12)	(471)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(43)
Net loss	(11,721)				(11,721)
Unrealized foreign currency translation adjustments	(27)
Unrealized translation adjustment	(27)					(27)
Ending balance at Mar. 31, 2017	113,669	$ 9,482	$ (2,519)	(5,782)	112,692	(204)
Ending balance (in shares) at Mar. 31, 2017		31,607	8,397
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	4,463			4,463
Restricted shares issued	0		$ 64	(64)
Restricted shares issued (in shares)			213
Shares issued upon exercise of stock options and SSARs	0		$ 2	(2)
Shares issued upon exercise of stock options and SSARs (in shares)			8
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(1,300)		$ (33)	(1,267)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(107)
Net loss	(8,350)				(8,350)
Unrealized foreign currency translation adjustments	(51)					(51)
Ending balance at Mar. 31, 2018	$ 108,431	$ 9,482	$ (2,486)	$ (1,911)	$ 103,601	$ (255)
Ending balance (in shares) at Mar. 31, 2018		31,607	8,283